Hello-

I have a sportmaster gearcase on a 300 promax. If you are facing the boat, on the right side of the gearcase near the nose end, were the case meets the midsection is this very small notch in the case (which looks like it should be there) and in the last week, gearcase oil has dripped from it down the case leaving a very small spot of oil on the ground. Has anyone experienced this before? Is this normal or something to be concerned about"? The color of the gearcase oil itself looks fine, and the drip started the day I changed the prop.

Any thoughts appreciated

Thanks

EA

may be the shift shaft seal. more than likely if it were the input shaft seal( whcich it could still be) you wouldnt find the oil driping due to the water pump circulating the oil along with the water.
also there is a vent kit to modify the case to help alleviate the blowing of seals on this case when they are used on cats with big wheels as the tend to run at high rpm's for prolonged periods of time creating big heat and then allowing water to invade the oil once you come off plane.

whats your application.

HI- thanks for the response.


Boat is a 24 Superboat. The oil has now stopped the drip from the right side, and then dripped from the left for a day, then stopped